Find the vertex of each parabola. SEE EXAMPLE 1 16. y=-x2 + 6x + 30
17. y = 3x2 + 12x - 5
I
Find the vertex and y-intercept of the
quadratic function, and use them to graph the
function. SEE EXAMPLES 1 AND 2
18. y = -x2 + 6x – 8 19. y = x2 – 8x + 11
20. y = 3x2 + 18x + 10 21. y=-2x2 – 12x - 5
22. A rocket is launched into the air. The path of
the rocket is modeled by the equation
y=-10x2 + 160x – 100. What is the maximum
height reached by the rocket, in feet?

Suppose that 3% of all athletes are using the endurance-enhancing hormone epo (you should be able to simply compute the percentage of all athletes that are not using epo). for our purposes, a “positive” test result is one that indicates presence of epo in an athlete’s bloodstream. the probability of a positive result, given the presence of epo is .99. the probability of a negative result, when epo is not present, is .90. what is the probability that a randomly selected athlete tests positive for epo? 0.0297